Square nut is a four-sided nut. Compared to standard hex nuts, square nuts have a greater surface in contact with the part being fastened, and therefore provide greater resistance to loosening.A Squar nut is usally assembled with a square headed bolt.

Machine Screw Square Nut Dimensions. Nominal size as a number/fraction and in decimal inches, and width and thickness in inches. (Note: Width across flats is basic width; width across corners and thickness are a calculated average rounded to the nearest 64th.)

Regular Square Nut Dimensions

NutSize

Width

Thickness

AcrossFlats

AcrossCorners

Basic

1/4

7/16

19/32

7/32

5/16

9/16

49/64

17/64

3/8

5/8

27/32

21/64

7/16

3/4

1 1/64

3/8

1/2

13/16

1 3/32

7/16

5/8

1

1 23/64

35/64

3/4

1 1/8

1 17/32

21/32

7/8

1 5/16

1 25/32

49/64

1

1 1/2

2 3/64

7/8

1 1/8

1 11/16

2 19/64

1

1 1/4

1 7/8

2 9/16

1 3/32

1 3/8

2 1/16

2 13/16

1 13/64

1 1/2

2 1/4

3 1/16

1 5/16

Regular Square Nut Dimensions. Nominal size, width and thickness in inches. (Note: Width across flats is basic width; width across corners and thickness are a calculated average rounded to the nearest 64th.)

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Square Nuts Surface Treatments

Hot Dipped Galvanizing Fasteners

Phosphate Fasteners

Teflon Fasteners

Xylon Fasteners

Zinc Fasteners

Cadmium Fasteners

Square Nuts Useful Information

square nuts are four-sided nuts as opposed to the more common hex (six-sided) nuts. The surface area on the flats is larger than hex nuts, which reduces wrench slippage. However, you cannot use hex drivers such as sockets and nut drivers. Machine screw square nuts are available in smaller sizes and also smaller in width and thickness than regular square nuts. Machine screw square nuts have flat tops and bottoms—the edges and corners are not chamfered (beveled). Regular square nuts have a flat bottom bearing surface and a crowned washer-faced top. Regular square nuts are often used with square bolts.

Threads are standard right-hand and Unified inch coarse series (UNC, Unified National Coarse) or Unified inch fine (UNF, Unified National Fine).Square nut size refers to its nominal thread diameter. Typically, machine screw sizes range from about #2 to 1/2″ and regular from 1/4″ to 1 1/2″. Sizes less than 1/4″ appear as a number size (the larger the number the larger the size) while sizes that are 1/4″ and larger are specified in inches, usually fractional rather than decimal.

Nominal or Basic Major Dia. of Thread

F

G

H

Width Across Flats

Width Across Corners

Across Corners Thickness

Basic

Max.

Mm.

Max.

Mm.

Basic

Max.

Mm.

1/4

0.2500

5/16

0.3125

3/8

0.3750

7/16

0.4375

7/169/16

5/8

3/4

0.4380.562

0.625

0.750

0.4250.547

0.606

0.728

0.6190.795

0.884

1.061

0.5840.751

0.832

1.000

7/3217/64

21/64

3/8

0.2350.283

0.346

0.394

0.2030.249

0.310

0.356

1/2

0.5000

5/8

0.6250

3/4

0.7500

7/8

0.8750

13/161

1-1/8

1-5/16

0.8121.000

1.125

1.312

0.7880.969

1.088

1.269

1.1491.414

1.591

1.856

1.0821.330

1.494

1.742

7/1635/64

21/32

49/64

0.4580.569

0.680

0.792

0.4180.525

0.632

0.740

1

1.0000

1-1/4

1.2500

1-1/2

1.5000

1-1/21-7/8

2-1/4

1.5001.875

2.250

1.4501.812

2.175

2.1212.652

3.182

1.9912.458

2.956

7/81-3/32

1-5/16

0.9031.126

1.348

0.8471.062

1.276

Industry Focus

Agricultural

Automotive

Construction

Electronics

Food Processing

Heavy Machinery

Marine

Mining

Nuclear

Oil, Gas, Petroleum

Energy

Medical

Transportation

Intended Application

Boilers

Bridges

Construction Machinery

Engineered Plumbing

Engines

Hydraulics

Impellers

Jewelry

Machine Tools

Water Treatment Plants

Materials (Metals)

Alloy Steels

Aluminum

Beryllium

Brass

Silicone Bronze

Carbon Steel

Magnesium

Molybdenum

Monel

Inconel

Nickel

Stainless Steel

Tin

Titanium

Materials (Plastic Polymers)

Various PlasticsNylon

Standard

BritishEnglishMetric

Hardening Specification

Heat Treated to any custom Specification

Fastener Types

*We can manufacture many custom fasteners to your specification*

Dowels & Pins

Hose Couplings

Nails

Rivets

Screws

Shackles

Shaft Couplings

Studs

Bolt Types

*We can manufacture many custom bolts to your specification*

Anchor

Bent

Eye

Hook

J

U

Elevator

Lag

T-Handle

T-Slot

Flange

Carriage

Bent

Plow

Bolt & Screw Head Types

*We can manufacture many custom head types to your specification*

Binding

Button

Fillister

Flat

Flat Undercut

Headless

Hexagon

Indented Hexagon

One-Way

Oval

Pan

Pentagon

Phillips

Round

Shoulder

Square Shoulder

Socket

Trimmed Hex

Truss

12-Point

Thread Types

*We can manufacture many custom thread types to your specification*

ACME

Drywall

Machine

Self-Tapping

Self-Drilling Drive Screws

Self-Drilling

Type 17

Type 23

Type 25

Type A

Type AB

Type B

Type F

Wood

UNC

UNF

Grades

*We can manufacture to many custom grades meeting your specification*

2

5

8

8.8

10.9

12.9

Bolt & Screw Drive Types

*We can manufacture many custom drive types to your specification*

Combination

Hex/Hexagonal

Phillips

Six Lobe

Slotted

Socket

Square

Tamper Resistant

Torx

Nut Types

*We can manufacture many custom nut types to your specification*

2-Way

Anchor

Cap

Castle

Conical

Coupling

Finished Hex

Flex Lock

Heavy Hex

Hex Flange

Hex Jam

Keps

Nylon Insert

Nylon Patch

Nylon Pellet

Semi-Finished Hex

Serrated Hex Flange

Slotted Hex

Square

Thumb

Top Lock

Wing

Finish

Automotive

Black Oxide

Brass Plated

Cadmium

Chromate

Chrome

Color Coated

Galvanized

Nickel Plated

Painted

Phosphate

Polished

PTFE

Silver Plated

Zinc Plated

Industry Standards

ANSI – American National Standards Institute

ANSI B 18.2.4 2M

ANSI B 28.2.4 1M

DIN

DIN 934

DIN 970

UTS – Unified Thread Standard

UNC

UNF

UNEF

UNS

NPT

NPTF

ISO – International Organization for Standardization

ISO 4032

ISO 4033

Production Volume

Min

Max

$60

Low Volume to High Volume

Several Million units

Diameter

Min

Max

M2

#4

M80

4 in

Square Nuts Packaging

Packaging:

In generally, If you have no special requirement, we will use the mass packing (bag carbon tray). If you want to do these special packing, please advise us the specific details, pictures or design.

Shipping:In generally, our customer often request to delivery by express, plane or sea. Any other better way will be also accepted well.

For a standard or special fastener, we are at your service! We specialize in corrosion-resistant components, those made from stainless steel and non-ferrous alloys. Look to TorqBolt for fine products and reliable information. Contact us today to learn more about our corrosion-resistant fasteners.